Cup-ring-packed piston or plunger.



A GU}? RING PACKED PISTON OR PLUNGER. APILIQATION rum) JUNE 21,1913.

Patented Jan. 13, 191%.

contain inorieating material which can be delivered by capillary attraction to the cylinder Walt, a series of recesses situated adnt to and communicating atintervals '5. space at the back of the ring, ocess to said recesses from the or said piston plunger for the purnlling the same with lubricating 1 and detachable closing means to us or" access for preventing the es ubricant other than at the periph- 01% the piston or plunger, substantially A cup ring packed piston or plunger having a space between a junk ring andpiston cc of a shape to contain the cup ring thewalls of such space being adapted to the outer curvcli portion of the down flange or lip of the cup ring n'"o:ide a space at the back of the 1. i l a 1d at the extremity of the flange or lip adapted to contain lubricating material which can be delivered by capillary attraction to the cylinder wall, during the reciprocation of the piston or plunger, and a series of recesses adapted to contain lubricant situated adjacent to and communicating at intervals'with the said space at the back of the cup ring, in combination with a series of recesses in the piston body having openings at the periphery thereof and adapted to deliver lubricant contained therein to the cylinder .wall by capillary attraction,

substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing'witnesses.

ARTHUR RONALD 'rrnsr. Witnesses:

WALTER CARVER,

O. J. WORTH. 

